package com.atguigu.lease.common.utils;

import com.atguigu.lease.common.exception.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import io.jsonwebtoken.*;
import io.jsonwebtoken.security.Keys;

import javax.crypto.SecretKey;
import java.util.Date;

public class JwtUtil {

    private static SecretKey secretKey = Keys.hmacShaKeyFor("QmNdDjZKu6Sc5X5zPdY5N6dnSb8Ff5I5".getBytes());

    //创建token
    public static String createToken(Long userId, String username) {

        //毫秒
        String jwt = Jwts.builder()
                //设置token的过期时间
                .setExpiration(new Date(System.currentTimeMillis() + 3600000*24*365L))
                .setSubject("LOGIN_USER")
                .claim("userId", userId)
                .claim("username", username)
                .signWith(secretKey, SignatureAlgorithm.HS256)
                .compact();
        return jwt;
    }

    public static Claims parseToken(String token){

        //解析token  如果token 为null 直接抛出未登录异常
        if(token==null){
            throw new LeaseException(ResultCodeEnum.ADMIN_LOGIN_AUTH);
        }

        try {
            JwtParser jwtParser = Jwts.parserBuilder().setSigningKey(secretKey).build();
            Jws<Claims> claimsJws = jwtParser.parseClaimsJws(token);

            return  claimsJws.getBody();
        }catch (ExpiredJwtException e){
            throw new LeaseException(ResultCodeEnum.TOKEN_EXPIRED);
        }catch (JwtException e){
            throw new LeaseException(ResultCodeEnum.TOKEN_INVALID);
        }


    }

    public static void main(String[] args) {
        System.out.println(createToken(2L, "15394365412"));
    }
}
